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Wedding cupcakes

The wedding is on sunday and I need 200 cupcakes plus a small slicing cake.
Will my cupcakes lose quality/ moistness if I freeze them? Any great recipe suggestions? I am making chocolate, coconut, pumpkin spice, maybe lemon too.
Also, any great frosting suggestions? The bride and groom are not fans of italian meringue so I was thinking of just a buttercream. Maybe one using flour to reduce over sweetness?